Automatic weighing-scale.



. No. 887,913. PATENTED MAY 19, 1908.

G. L. BOND. AUTOMATIC WEIGHING SCALE.

AYPILIOATION FILED MINI-318, 1904.

2 SHEETS-SHEET l.

G. L. BOND.

AUTOMATIC WEIGHING SCALE.

APPLICATION FILED JUNE 18, 1904.

PATENIED MAY 19, 1908.

2 SHEETS-SHEET 2 A spring 23 is attached to the pivpted arm to exert pressure thereon in a direction to move arm 15 toward the scale beam and means are provided for varying the tension or force of said springs; said means consisting, for example, of a handle or lever 26 pivoted at 27 to a fixed su port and connected by link 28 and bell crar 29 with one end of the spring.

The adjusting lever 26 may have an operating knob 30 and a pointer 31 working over a graduated scale 32 on a plate 33 extending from the case, and sna s into the graduation thereof to hold the in ex in set position.

The box or case 13 is desirably fastened to the overhanging arm or bracket 35 of the scale frame in such manner as to be detachable therefrom as by screws 36. In. order that the pivoted frame 14 shall move with a minimum of friction against the scale beam, it, may be formed as a parallel motion device comprising lower and upper members 37, 38, pivoted to the bracket 19 at one end and connected by a tie-bar or link 39, and the spring 23 may be attached to an extension of said tie-bar. The arm 15 which serves as a depression device for the pivoted frame may be formed as an extension from the lower member 37 and the contact device 17 may be formed as an extension from the upper member 38.

The preferred construction'of the electromagnet cut-olf for the trip device is shown in detail in Figs. 6 and 7. A rock shaft 40 pivoted in the box 12 carries the operating handie 7 which is attached to the'said rock shaft outside of the box. An arm 41 on said rock shaft, within the box, swings over the latch plate 9 which is pivoted on a standard 42;

said latch plate has a tooth 43 which engages with the top of the armature 10-to hold the latch plate in elevated position and said plate has a shoulder, notch, or cam portion 44 which. is engaged by the arm 41, when the handle 7 is operated to lift the latch into position to engage the armature, the arm then seating in the notch and engaging by the action of the spring 8 with the other side of the notch so as to tend to hold the latch plate against the armature. When the magnet is energized and the armature attracted, the latch plate will fall by gravity and the action of the spring releasing the arm 41 from the notch 44 will allow the arm to be moved by the spring 8 to close the valve or cut-off 6. A contact 45, preferably a spring, is supported on and. insulated from the box 12 in position to engage and contact with the arm 41 when the valve has been moved to open position, the contact so established being in the electric circuit of the magnet 11 and the energizing battery, so that as soon as the trip device is released and the valve moves to closed position, the contact will be broken and waste of the battery will be avoided. When the handle is operated to open the valve, the electric connection is reestablished at'this contact so that as soon as connection is made at contacts 17, 19, controlled by the scale, the magnet will be energized. The electric connections are shown in Fig. 1, 46 designating the battery from which connec tion is made by wire 47 to binding post 21 connected to the movable contact 17 of the scale controlled contact device, the fixed contact 18 thereof being connected through the binding post 22 and a wire 51 to the binding post 48 connected to one end of magnet 11,

' the other end ofwhich is connected to the box 12. Said box is of conducting material and continues the connection through the rock shaft 40 and arm 41, and when the valve is open, to contact spring and the binding post 49 connected thereto; from said binding Best a wire 50 leads to the other side of the attery.

I may provide a holder for the bag or receptacle to be filled, said holder comprising a ring 56 adapted to enter the mouth of the bag' and hold it inopen. position beneath'the delivery and a standard or post 57 for supporting said ring.

58, in Fig. 8, designates a reducing bushing that may be provided in the outlet of the delivery to reduce the rapidity of flow therethrough, said bushing having a central orifice of a size adapted to the material to be used or the quantity to be weighed. Thus when the scale is used mostly for weighing very small quantities, this orifice may be correspondingly small, to give sullicient accuracy of action. A flange 60 on the bushing rests on a shoulder 61 of the outlet pipe 5 to retain the bushing in place. 78 is a slide for cutting off the flow entirely.

The operation of the device is as follows Adjusting lever 26 is moved to the position on the graduated scale corresponding to the kind of material that is to be weighed, thus for sugar it will be moved to a certain point, while for coffee it will be moved to another )oint; the proper position for each material being determined by experiment; it being understood that the position of the adjusting device will in each case be such that the tension of the spring 23 will thereby be made sufficient to compensate for the quantity of material that falls on the scale, after the contact device is operated to close the valve. The operator having adjusted the weight 52 of the scale to the nosition corresponding to the amount to be weighed, and having placed the bagor other receptacle in position on the 7 of material,

by simultaneously closing the connection from the battery and. electro-magnet trip device'tothe controlling contact device'on thescale. The valve will-now be held open by latch means '9 and the material will flow therethrough into the bag or receptacle. The upward pressure of the contact device on the scale beam will cause the latter to rise shortly before the predetermined amount of material has reached the scale, and as the scale beam so rises, the contact device follows it up and imi'nediately closes the con tact at.17 and ]8,'to energize. the magnet 11 of the trip device which releases the cut-oil, as above explained,- and shuts off the supply There, will, however, be a certain amount-oi material Falling i'romll'ie cutotl to the scale or receptacle thereon and the contact device is so adjusted, above explained, that when this material all reaches the receptacle, just the predetermined weight will be obtained. The release oi this. trip device also operates to break the electric circuit, as above explained.

The construction of the various parts may be modified to suit various conditions without departing from my invention. ()ne 'such modification is shown in Fig. 9, wherein the coun terbalancing' con tact d evicc is shown as a supplementary scale 64,pivo.tally mounted on a standard 69 extending up from the base 1 thebcam 3 of the main scale havin I 4 h an arm 65 extending over an arm 66 on said supplementary scale to norn'ially c mpress the same and elevate the other end of the supplementary 'scale beam which is provided with a graduated scale arm 67 and a weight -68adjustable thereon. The end of the arm 66 extends through an opening 70 i in 'a bracket 71 supported on but insulated from the standard The supplei'nentary scale beam and the insulated bracket are connected to wires above referred to, similar to contacts]? and 18 so that as the arm 66 of the supplei'nentary scale beam rises and touches the top oi the opening 68 it will close the electric circuit, as above explained, to release and close the cut-oil. The weight 68 beingslidable on the graduated scale 67 serves to adjust and at the same time indieate the adjustment of the pressure that the supplementary scale exerts on the main scale.

The parallel motion support of arm 15, see Fig. 4, enables said arm to have the same leverage about. the pivotal center at difi'erent points along its length, so that the ell'ect of the counterbalancing device'as Indicated by the graduated scale 13 remains the same whatever maybe the position of the scale arm over the arm 15. This feature is of value it maintains the adjustmentwhile allowing the usual longitudinal swing of the balance beam. A similar eitect isolitaincd by the arrangement of depending arm and the arm 66 of the supplementary scale in Fig. 8.

In case very heavy weights are to be measured, it is sometimes desirable to diminish the flow of materialjtoward the end of the Weighing'so as to" render the cutoff more accurate." For this purpose, I may use the construction indicated diagrammatically in Fig. 10 wherein a plurality of cut-oils 6, 6, are provided, the upper cut-off having an orifice 72 and the lower cut-off being imperforate. The construction of each of these cut-oil's may be identical with that of the cut-oil above described, except that in case Spring 75 may .be in metallic connection with the case and contact 76 is connected by wire 77 withmagnet llof the uppercut-oil', so that as the scale starts to rise the magnet 1 1 will first operate to close the cutofi 6, thus reducing the rapidity of flow, and the magnet 11 of the lowe cut-oi'i I 6 is operated by closure of contacts 17, 18, to totally stop the flow.

The apparatus is thus seen to com rise a pair of graduated scales,-each adapte to be readily set by inspection and without trial adjustment at pre-detcrmined weights thc one being auxiliary to the other and adapted to lift the other or main-scales from below to assist said other scales when the material thereon and between the same and the cut- OH is equal to the total weight desired to be finally weighed, and said main scale is left perfectly free for weighing the material after such assistance has occurred.

What I claim iszl. The combination of a Weighing scale and a delivery tube for delivery of material thereto, a magnetically controlled cut-oil device for said tube, an adjustable counterbalancing device for exerting pressure on the scale to compensate for the weight of the imiterial falling from the cut-oil device to the scale.

after the closure of the cut-oii'-device andmoving responsively to the movement of the scale, means for indicating the amountot adjustment ol' the counterbalancing device, and an electric circuit including contacts con trolled by the movement of said. counterbalancing device'and controlling the magnetic cut-o'll" device.

2. The combination of a weighing scale and a delivery tube for delivering material thereto, a cut-off device-for said tube, counterbalancing means for exciting pressure scale in the same direction as the weight of the material and moving responsively to the movement of the scale, means for adjusting such pressure, and actuating means for said cutoll device controlled by movement of said counterbalancing means, said counterbalancing means comprising a pivoted device havinga part extending into position for engaging a moving partol' the scale, a spring connected to said pivoted device, and means for adjusting the tension of said spring.

3. The combination of a weighing scale and a delivery tube for delivering material thereto, a cut-off device for said tube, counterbalancing means for exerting pressure on the scale in the same direction the weight of the material and moving responsively to the movement of the scale, means 'for adjusting such pressure, and actuating means for said cutoil device controlled by movement of said counterbalancing means, said counterbalancing means comprising a pivoted device havinga part extending into position for engaging a moving part of the scale, a spring connected to said pivoted device, means for adjusting the tension of said spring, comprising an index handle, a graduated scale over which the indexto the handle moves, and a connection from said index handle to the spring.

4. The combination of a weighing scale, means for delivery of material thereto, a cutoii device for said delivery means, a rock-- shaft carrying said cut-oil device and provided' with an operating handle, a spring connected to the cut-oil device for moving it to closed position, an arm cormected to the rock shaft, a latch engaged by said arm, amagnet rovided with an armature for engaging said Patch, a contact engaging said arm when the valve is in open position, and a controlling electric circuit including said magnet and said armature and contact.

5. An automatic weighing scale comprising scale means, delivery means, a reducing cutoll' for the delivery means, a total cut-oti for the delivery means, a plurality of contacts on the pressure, and electric circuits and magnets controlled by said contacts to successively operate said cut-oil's.

6. The combination of a weighing scale and a delivery tube for delivering material thereto, a cut-off device for said tube, counterbalancing means for exerting pressureon the scale in the same direction as the weight of the material and moving responsively to the movement of the scale, means for adjusting such pressure to compensate for the Wei ht of the material'falling from the cut-off device to the scale after closure of said cut-off device, said counterbalancing means engaging with the scale by a part thereof whose leverage is constant along its length, and actuating means for said cut-ofi' device controlled by movement of said counterbalancing means, and provided with means for indicating the amount of adjustment.

7. The combination of a weighing scale and a delivery tube for delivering material thereto, a cut-oil device for said tube, counterbalancing means for exerting pressure on the scale in the same direction as the weight of the material and moving responsively to the movement of the scale,nieans for adjusting such pressure, and actuating means for said cut-oil' device controlled by movement of said counterbalancing means, said counter-- balancing n'ieans comprising a parallel motion pivoted device having a part extending into position for engaging a moving part of the scale, a spring connected to said pivoted device, and means for adjusting the tension of said spring.

Iii testimony whereof, I have hereunto set my hand at Los Angcles, (alifornia, this 10th day of June, 1004.

' CHAPJLES L. BOND. In presence of- Airmen P. lirvron'r JILIA 'lmvrvsnxn. 

